.shake-btn {
  &:hover,
  &.animated {
    animation: shake 0.75s;
  }

  &.animated {
    animation-iteration-count: infinite;
  }

  @keyframes shake {
    0% {
      transform: rotate(0deg);
    }
    16.6% {
      transform: rotate(-25deg);
    }
    33.2% {
      transform: rotate(25deg);
    }
    49.4% {
      transform: rotate(-25deg);
    }
    66% {
      transform: rotate(25deg);
    }
    82.6% {
      transform: rotate(-25deg);
    }
    100% {
      transform: rotate(0deg);
    }
  }
}